Thirteen climate change protesters who can be seen in this footage on the runway at Heathrow have been found guilty of aggravated trespass.

The men and women cut through a perimeter fence at 3.45am breaking into London's busiest airport.

Around 25 flights were cancelled as the Plane Stupid activists built a tripod from scaffolding poles and locked themselves to it.

The 13, campaigning against expansion at Heathrow , had locked themselves onto the structure, one with a ligature around his neck, while others lay in pairs with arm locks in expanding quick set foam.

Protestors: Plane Stupid activists found guilty (Image: Met Police)

According to the Metropolitan Police the design of the structure and 'lock-ons' meant that neither the metalwork nor the protesters could easily be moved.

They were arrested in situ on Monday, July 13, 2005 while specialist officers were called in to safely remove them.

Heathrow: Dozens of flights delayed (Image: Met Police)

A number of items were seized, including superglue, locks, chains and pieces of steel pipe.

The northern runway was finally cleared for full operational use just after 10am.

Superintendent Andy Jones, from the Met's Aviation Policing, said: "While it is the role of the police to facilitate peaceful protest it is also our role to uphold the law and to allow businesses and the public to go about their lawful business.

Arrested: Police move in on protesters (Image: Met Police)

"When protesters encroach into the airside environment they not only cause major disruption but also significant danger to themselves and aircraft.

"These convictions send out a clear message that such behaviour will not be tolerated.

"I appreciate that airport expansion will trigger protest but I would urge those considering such action, to do so peacefully and within the bounds of the law."

Heathrow: They are campaigning against climate change (Image: Getty Images)

The guilty 13 are:

Rebecca Holly Sanderson, 28, of Newton Road, Machynlleth, Powys

Melanie Strickland, 32, of Borwick Avenue, Waltham Forest, E17

Richard Steven Hawkins, 32, of Heol y Doll, Machynlleth, Powys

Ella Gilbert, 23, of Magdalen Street, Norwich, Norfolk

Danielle Louise Paffard, 28, of Blenhiem Grove, Southwark, SE15

Graham Edward James Thompson, 42, of Durlston Road, Hackney, E5

Robert Anthony Basto, 68, of Blackborough Road, Reigate, Surrey

Kara Lauren Moses, 33, of Heol y Doll, Machynlleth, Powys

Cameron Joseph Kaye, 23, of Kenwood Close, Sipson, West Drayton

Edward Thacker, 26,of Kenwood Close, Sipson, West Drayton

Alistair Craig Tamlit, 27,of Kenwood Close, Sipson, West Drayton

Sheila Menon, 44,of Pellerin Road, Hackney, N16

Sam Sender, 23, of Kenwood Close, Sipson, West Drayton

The trial took place before District Judge Wright at Willesden Magistrates' Court.